<!-- 登陆组件 -->
<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!-- 登陆表单区域 -->
      <el-form ref="loginFromRef" status-icon label-width="0px" class="login_form" :model="loginForm"
        :rules="loginFormRules">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="el-icon-user-solid" v-model="loginForm.username"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input prefix-icon="el-icon-lock" v-model="loginForm.password" type='password'></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登陆</el-button>
          <el-button type="info" @click='resetLoginForm'>重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        //登陆表单的数据对象
        loginForm: {
          username: 'admin',
          password: '123456',
        },
        //表单的验证规则对象
        loginFormRules: {
          //验证用户名是否合法
          username: [
            { required: true, message: '请输入登陆名称', trigger: 'blur' },
            { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
          ],
          //验证密码是否合法
          password: [
            { required: true, message: '请输入密码', trigger: 'blur' },
            { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
          ]
        }
      };
    },
    methods: {
      //点击重置按钮，重置登陆表单
      resetLoginForm() {
        this.$refs.loginFromRef.resetFields()
      },
      login() {
        this.$refs.loginFromRef.validate(async valid => {
          if (!valid) return;
          const { data: res } = await this.$http.post('login', this.loginForm)
          if (res.meta.status !== 200) return this.$message.error('账号密码错误！')
          this.$message.success('登陆成功！')
          // 1.将登陆成功后的token，保存到客户端的sessionStorage中
          //   1.1 项目中除了登陆之外的API接口，必须在登陆之后才能访问
          //   1.2 token只应当在打开期间生效，所以token保存在sessionStorage中
          window.sessionStorage.setItem('token', res.data.token)
          // 2.通过编程式导航跳转到后台主页，路由地址是 /home
          this.$router.push('/home')
        })
      }
    },
    components: {},

    computed: {},
  }

</script>
<style lang='less' scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
  }

  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
  }

  .avatar_box img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }

  .btns {
    display: flex;
    justify-content: flex-end;
  }
</style>